CMSI Editor is a free, light and straightforward application that allows you to change the Computer Manufacturer and Support Information. Using it is very easy: all you need to do is modify the Computer Manufacturer, Model, Support Url and Support Information fields. You can also modify view and change the logo of your manufacturer.

CMSI is made available in portable form, meaning you only need to extract the contents of the archive and run the executable....Read more about CMSI Editor